Gas-furnace.



R. A. MERRILL.

GAS FURNACE. APPLICATION FILED OCT. 29, 1914.

Patentd Jan.4, 1916'.

aw 4 3 1 .Z 6 52 3 5 u 1 .m m ,5 \ll Q w I g ROBERT A. MERRILL} 0F CINCINNATI, OHIO,

ASSIGNOR TO THE EAGLE WHITE LEAD COMPANY, OF CINCINNATI, OHIO, A .QORPORATION OHIO.

' GASJURNACE.

heating'furnaces of the type employing gas as fuel and has for an object to produce a nozzle 11, so .gasand air 'mixed Within thereof. Ihave so constructedthe discharge ,Each ofthe burnerse,

.of the furnacefire' pot. 'rangement of the vertically alined mixing burner Which insures a thorough admixture .of airwith the A further object is to'pr'oducea. gas burner gas to be burned.

for heating furnaces, Which'is adapted to distribute the flame as it ssues from the burner, so that a IIIOI'QHIllfOI'IIl area of flame is presented to. the surfacesto be heated.

Theseand other objects areattained in the apparatus described in the following specification and illustrated in the accompanying drawings in Which;

Figure. 1 is a transverse sectional view of an ordinary hot air-heat ng furnace; With a i v one another in producing a burner attachment embodying my invention mounted therein. S'Fig. 2 is a sectional View taken on the line 2 20f F 1.

illustrated asan embodiment of'my invention, consists of a mixingtube 9, a gas nozzle. 11, an'd abell shaped hood .12 surrounding the gas nozzle, ligand secured tothe mixing tube 9.

This hood 12 is provided for the purpose of directing and permitting air to be drawn into the mixing tube ,9 and to be properly mixed 'Withthe jet of gas issuingfrom the thatthe proper proportions of are provided and thoroughly emg consumed 'at the gas burning end endofthe mixing. tube, that it is fiared to ifo'rm an unobstructed'bell shaped mouth,

the end of Which isconstructed to direct the flow of gas and flame against the outervvall The particular'artube, the air gathering'bell-shaped hood 12,

and the mixing tube 9' with its unobstructed bell mouthed discharge end, producing a most thorough mixtur'eof gas andair Which insures complete combustion at the'discharge .The nozzle/ll is mixing Lood 12,

end -of the mixing t-ube, secured to the bell shaped by means of a cage 13, surrounds the .fl

lation to one another.

of each relates to improvements in which is secured the burners the mixing tube, previous to i each angle plate 4 and fuel into and through the. bed of.

4 alsoj for the .to

Patented Jane, 1916.

.hood l2 and is secured to the base. of the i y this means'the'parts of the nozzle 11. burner areheld in proper position With i-e.-

' As illustrated, the burners are divided into groups,the burners are connected :in. turn to the supply pipes 6." The gas nOZZles 11 areconstructed so that the proper amount of gasis delivered to the burner, and the cages 13- are so constructed as to air to pass therethrough,.,to mixwith the I gas issuing from the nozzles 11'. 'Thispermanent regulation of the air and gas is made at the factory Where the assembled, so as to prevent the operatorof the furnacefrom tampering With the flir-v nace and thereby disturbing the proper 'amount'of air. and gas 'cleliveredtheretotburners 'are being The apparatus illustrated in connection group are secur'edto pipes 14 Which with my improved burners, consists of a 3 I fire pot of the furnace, so that the' sectio ns, cooperate ith continuous anseries 'of section s3 "which arefadapted to be arranged [Within the nular ring Within the fire pot, forthe purpose of receiving. pieces'of fire brick or clay which constitute the bed of incandescent heatradiating coals after. the apparatus has been placed in" operation. I Each. of'jthese sections? consists of'an angle plate 4, in

5., The burners of each section are connected to the separate gas 'supp'lypipesfi as above described,

fWh ch are connected With the main gas sup- :ply pipe 7, by'mean's .of separate valves 8 adapted to control the supply ofgas tothe.

lmrners of each section. I It W ll be seen upon referring to the drawing, that the mixing tube of each of the burners '5, extends through the bottom of delivers the burning I coals 10 located onthe angle plates, The pieces of fire brick or clay are arrangedlon the'angle located between the bell. mouthed aperture of the mixing tube and the Wall of' the fire pot, to prevent the-direct heat of the-flame from injuring the Wall of the fire pot and purpose of causing pick up, a portion of the heat of combustion as the flame is projected ,therethrough toward the .Wall of the firepot. 7 After the an eiimpin'ges upon thesurface of the firev platesso that a suificientquantity thereof is I the fire brick V pot passes upwardly throughthe, entire will burn at through the bed strikingthe surface of the fire pot in a relamass of fire brick, a bed of incandescent coals is'produced, which retains the heat of the flame and consequently increases the area of active radiating surface.

My apparatus as illustrated is readily adapted to be installed in ordinary heating furnaces in which coal has previously been used, and for the purpose of carrying out such an installation it is but necessary to remove the grate of the furnace and to assemble the angle plates 4: with their attached burners, to form the ring of sections 3 within the fire pot. Any suitable means such as the brackets 15, may be provided for supporting the angle plates and the burners within the fire pot after the sections 3 are assembled. The pipes 14 connecting the burners of each section, are then connected to the supply pipe 6 and the valves 8 are then connected to the pipes 6 and the main supply pipe 7. 'lhe ap aratus is then ready for use after the incombustible fuel 10 is properly placed on the angle plates and around the flared combustion end of the mixing tubes.

In operation: The gas having been ignited v the bell mouthed apertures of the burners, the flame produced by the combustion thereof, passing transversely of incombustible fuel and tively wide expanse of flame, so that the flames of ad acent burners will unite to form a large annular wall of flame contacting the inner surface of the fire box. After striking the wall of the fire box, the flame will be diverted back toward the center thereof and will pass upwardly through the bed of fire brick. 'l'his flame passing upwardly through the fire brickwill produce a bed of incandescent coals which serve to abstract substantially all of the heat of combustion from the flame passing therethrough and to transmit this heat from the bed of coals to the radiating surfaces of the furnace. This leaves the products of combustion substantially free from heat, so that they may be passed out of the furnace and into the flue. It will be observed that the flame created by my burner attachment, is annular in formation and that this flame contacts and passes upwardly along the inner walls of the fire pot after having passed through the bed of coals located on the angle plates l. In order therefore, to create more thorough combustion and to cause theproducts of combustion to pass off more rapidly, I have provided the central opening 15, so that the fresh air from the ash pit will pass therethrough and carry the roducts of combustion into contact with the walls of the furnace. In addition to these advantages thus secured by this central air duct construction, I am enabled to create :1.

, constant circulation of fresh air through the ash pit of the furnace, where the air drawn in through the hoods 12 and mixing tubes 9 of the burners, may be of the purest and richest in oxygen and free from the products of combustion to be found in the upper portions of the furnace. This produces a flame which is intensely hot and which consequently reacts upon the bed of coals and other radiating surfaces, to produce a more efficient heating plant than other heating plants known to me. Having thus described my invention, what I claim is:

1. in a heating furnace, the combination 'of a fire pot, and a series of burner sections located within and secured to the inner walls of the fire pot, said sections forming an annular ring adapted to receive incombustible fuel, each of said sections comprising an angle plate, and a series of burners secured to and extending above the fuel supporting surface of said angle plate, said burners being adapted to project flame into the fuel and against the walls of said fire box.

2. In combination in a heating furnace, a fire pot, angle plates located in said fire pot and adaptedto support incombustible fuel, burners secured to said angle plates and projecting into the fuel located on said angle plates, said burners comprising a mixing tube secured to the angle plates and having a flared discharge aperture, a gas nozzle located at the inlet end of the mixing tube, and a hood surrounding the nozzle and adapted to direct air intothe mixing tube.

3. An attachment for heating furnaces comprising a series of heating sections adapted to fit together to form an annular incombustible fuel holder Within the furnace fire pot, and a series of burners secured to the bottom of said fuel holder and extending therethrough, each of said burners comprising a mixing tube having a flared discharge end turned to discharge flame through the incombustible fuel and against the inner wall of the furnace fire pot.

4. A gas burner attachment for heating furnaces comprising a series of angle plate sections adapted to be secured to the walls of the furnace fire pot, said sections forming an annular incombustible fuel container, with a centrally disposed air passage, a series of burners secured to each angle plate, said burners communicating with separate fuel supply pipes, and consisting of a gas nozzle, an air intake hood surrounding the gas nozzle, and a mixing tube secured to the hood,'said mixing tube having its discharge end turned toward the wall of said fire pot and flared to produce a relatively wide flame. v

5. In combination in a heating furnace, an ash pit, a fire pot mounted on the ash pit,

angle plates located Within said fire pot to leave a centrally series of burners disposed about the air passage and secured to said angle plates, separate gas supply pipes located in said ash pit and communicating with said burners, and incombustible fuel located on said angle plates between said plates and said fire pot, said burners being adapted to discharge flame through the incombustible fuel located on said angle plates to render said fuel incandescent.

6. In a gas burner the combination of a vertical mixing tube having its upper end Copies of this patent may be obtained for five cents each, by addressing the Commissioner Washington, D. C.

disposed air passage, a

bent horizontally and flared outwardly, forming an enlarged unobstructed dis- 5 charge, and a gas nozzle below the mixing tube and adapted to direct a stream of gas upwardly into the mixing tube.

In testimony whereof, I have hereunto subscribed my name this 26th day of Octo- 2o ber, 1914.

ROBERT A. MERRILL.

Witnesses:

WALTER F. MURRAY, W. THORNTON BOGERT.

of Patents, 

